Hello and thank you for your question. I look forward to assisting you today. First make sure you remove all power immediately. About the only option now, is to put it in a zip lock bag and cover it with white rice. The rice will pull any moisture out of the camera that is left. This will take several days so be patient.
If you have more questions, please let me know. There are not many options for electronic devices that have been exposed to water, and especially salt water. That will eventually corrode the circuit boards provided it hasn't already started.